Bark extracts and their use in plywood bonding

Leena Suomi-Lindberg

Research output: Book/ReportReport

Abstract

The research deals with extractants of bark. Park of spruce (Picea shies) was extracted with different solvent and extraction conditions. The extraction solvent always consisted of water and added Na2SO3, SO2 or methanol. Solvent and extraction procedures had great influence on extract yield and the polyphenolic content of extract (Stiasny number). With pure water the extract yield and tannin content of the extract were low. Using different chemicals, such as sulphite or alkali, as mentioned above, polyphenolics with higher yield and satisfactory reactivities with formaldehyde could be extracted. Especially extraction with alkali considerably increased the yield of extracts. In gluing experiments were made three-ply birch plywood consisting of 250 x 250 x 1,5 mm birch veneers or nine-ply birch plywood consisting of 500 x 500 x 1,5 mm birch veneers. No pure tannin based adhesives were used. Extracts were always added to different phenolic resins (so far FXTER A or EXTER B). Plywoods were glued under very normal gluing conditions used in industry. Plywoods were tested as prescribes in Finnish plywood standard SFS 2416. The results showed that up to 20 % of phenolic resins can be replaced by spruce extracts so that the plywoods fulfilled the limits of Finnish plywood standard SFS 2415 and Finnply quality control.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages60
ISBN (Print)951-38-2140-4
Publication statusPublished - 1984
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number307
ISSN0358-5077

Fingerprint

plywood
bark
Betula
extracts
Picea
alkalis
resins
tannins
polyphenols
sulfites
formaldehyde
adhesives
quality control
methanol
water
industry

Keywords

  • spruce wood
  • pine wood
  • bark
  • extraction
  • adhesives
  • plywood
  • bonding

Cite this

Suomi-Lindberg, L. (1984). Bark extracts and their use in plywood bonding. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 307
Suomi-Lindberg, Leena. / Bark extracts and their use in plywood bonding. Espoo : VTT Technical Research Centre of Finland, 1984. 60 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 307).
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Suomi-Lindberg, L 1984, Bark extracts and their use in plywood bonding. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 307, VTT Technical Research Centre of Finland, Espoo.

Bark extracts and their use in plywood bonding. / Suomi-Lindberg, Leena.

Espoo : VTT Technical Research Centre of Finland, 1984. 60 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 307).

Research output: Book/ReportReport

TY - BOOK

T1 - Bark extracts and their use in plywood bonding

AU - Suomi-Lindberg, Leena

PY - 1984

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N2 - The research deals with extractants of bark. Park of spruce (Picea shies) was extracted with different solvent and extraction conditions. The extraction solvent always consisted of water and added Na2SO3, SO2 or methanol. Solvent and extraction procedures had great influence on extract yield and the polyphenolic content of extract (Stiasny number). With pure water the extract yield and tannin content of the extract were low. Using different chemicals, such as sulphite or alkali, as mentioned above, polyphenolics with higher yield and satisfactory reactivities with formaldehyde could be extracted. Especially extraction with alkali considerably increased the yield of extracts. In gluing experiments were made three-ply birch plywood consisting of 250 x 250 x 1,5 mm birch veneers or nine-ply birch plywood consisting of 500 x 500 x 1,5 mm birch veneers. No pure tannin based adhesives were used. Extracts were always added to different phenolic resins (so far FXTER A or EXTER B). Plywoods were glued under very normal gluing conditions used in industry. Plywoods were tested as prescribes in Finnish plywood standard SFS 2416. The results showed that up to 20 % of phenolic resins can be replaced by spruce extracts so that the plywoods fulfilled the limits of Finnish plywood standard SFS 2415 and Finnply quality control.

AB - The research deals with extractants of bark. Park of spruce (Picea shies) was extracted with different solvent and extraction conditions. The extraction solvent always consisted of water and added Na2SO3, SO2 or methanol. Solvent and extraction procedures had great influence on extract yield and the polyphenolic content of extract (Stiasny number). With pure water the extract yield and tannin content of the extract were low. Using different chemicals, such as sulphite or alkali, as mentioned above, polyphenolics with higher yield and satisfactory reactivities with formaldehyde could be extracted. Especially extraction with alkali considerably increased the yield of extracts. In gluing experiments were made three-ply birch plywood consisting of 250 x 250 x 1,5 mm birch veneers or nine-ply birch plywood consisting of 500 x 500 x 1,5 mm birch veneers. No pure tannin based adhesives were used. Extracts were always added to different phenolic resins (so far FXTER A or EXTER B). Plywoods were glued under very normal gluing conditions used in industry. Plywoods were tested as prescribes in Finnish plywood standard SFS 2416. The results showed that up to 20 % of phenolic resins can be replaced by spruce extracts so that the plywoods fulfilled the limits of Finnish plywood standard SFS 2415 and Finnply quality control.

KW - spruce wood

KW - pine wood

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M3 - Report

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Suomi-Lindberg L. Bark extracts and their use in plywood bonding. Espoo: VTT Technical Research Centre of Finland, 1984. 60 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 307).